Just Plug them on For Your Collins Radio. It has a bias adjustment . Hi Voltage, Medium, and Heater. Can be on/off from the Radio unit. Just like 516F2 .solid state.
Call +6285814242877 IDR 3.280.000,-
SHIPPING AND HANDLING IS NOT REFUNDABLE AT ANY COST. ONCE ITEM IS SHIPPED,RETURN OF ITEM BUYER HAVE TO BARE THE SHIPPING COST.